Remove non-existent engines
Fix comment about delete event
Update events to be more accurate to ones emitted
Add events docs
Add name to credits
Fix engine bullet list
Update travis CI badge from entity-store to save
Add note about seeing mongodb for example
Add line break to credits to ensure not on the same line
Add example
Add usage to README
Merge pull request #7 from domharrington/readme

Add usage, examples and events to README